Full Idea
Many philosophers agree that true existential propositions have a truth-maker, but some go further, claiming that every true proposition has a truth-maker. More cautious theorists specify a class of truths, such as synthetic propositions.
Gist of Idea
Truthmakers for existence is fine; otherwise maybe restrict it to synthetic truths?
Source
David Liggins (Truth-makers and dependence [2012], 10.1)
Book Reference
'Metaphysical Grounding', ed/tr. Correia,F/Schnieder,B [CUP 2012], p.254
A Reaction
[compressed; Armstrong is the ambitious one, and Rodriguez-Pereyra proposes the synthetic propositions] Presumably synthetic propositions can make negative assertions, which are problematic for truth-makers.